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/*-
* Copyright (c) 2011 Google, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* Userboot disk image handling.
*/
#include <stand.h>
#include <stdarg.h>
#include <uuid.h>
#include <bootstrap.h>
#include "disk.h"
#include "libuserboot.h"
int userboot_disk_maxunit = 0;
static int userdisk_init(void);
static int userdisk_strategy(void *devdata, int flag, daddr_t dblk,
size_t size, char *buf, size_t *rsize);
static int userdisk_open(struct open_file *f, ...);
static int userdisk_close(struct open_file *f);
static void userdisk_print(int verbose);
struct devsw userboot_disk = {
"disk",
DEVT_DISK,
userdisk_init,
userdisk_strategy,
userdisk_open,
userdisk_close,
noioctl,
userdisk_print,
NULL
};
/*
* Nothing to do here.
*/
static int
userdisk_init(void)
{
return(0);
}
/*
* Print information about disks
*/
static void
userdisk_print(int verbose)
{
int i;
char line[80];
struct disk_devdesc dev;
for (i = 0; i < userboot_disk_maxunit; i++) {
sprintf(line, " disk%d: Guest drive image\n", i);
pager_output(line);
dev.d_dev = &userboot_disk;
dev.d_unit = i;
dev.d_slice = -1;
dev.d_partition = -1;
dev.d_offset = 0;
sprintf(line, " disk%d", i);
disk_print(&dev, line, verbose);
}
}
/*
* Attempt to open the disk described by (dev) for use by (f).
*/
static int
userdisk_open(struct open_file *f, ...)
{
va_list ap;
struct disk_devdesc *dev;
va_start(ap, f);
dev = va_arg(ap, struct disk_devdesc *);
va_end(ap);
if (dev->d_unit < 0 || dev->d_unit >= userboot_disk_maxunit)
return (EIO);
return (disk_open(dev));
}
static int
userdisk_close(struct open_file *f)
{
return(0);
}
static int
userdisk_strategy(void *devdata, int rw, daddr_t dblk, size_t size,
char *buf, size_t *rsize)
{
struct disk_devdesc *dev = devdata;
uint64_t off;
size_t resid;
int rc;
if (rw == F_WRITE)
return (EROFS);
if (rw != F_READ)
return (EINVAL);
if (rsize)
*rsize = 0;
off = (dblk + dev->d_offset) * DISK_SECSIZE;
rc = CALLBACK(diskread, dev->d_unit, off, buf, size, &resid);
if (rc)
return (rc);
if (rsize)
*rsize = size - resid;
return (0);
}
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